stoplight

Noun stoplight has 2 senses

• stoplight(n = noun.communication) brake light - a red light on the rear of a motor vehicle that signals when the brakes are applied to slow or stop;
is a part of brake system, brakes
is a kind of visual signal

• stoplight(n = noun.communication) traffic light, traffic signal - a visual signal to control the flow of traffic at intersections;
is a kind of light
has particulars: go-ahead, green light, red light, yellow light